ref: 9ced712a2ad70557a8ceb89ff3b969b92c85f68c
dir: /sys/src/cmd/eqn/text.c/
#include "e.h"
#include "y.tab.h"
#include <ctype.h>
#define CSSIZE 1000
char cs[CSSIZE+20]; /* text string converted into this */
char *csp; /* next spot in cs[] */
char *psp; /* next character in input token */
int lf, rf; /* temporary spots for left and right fonts */
int lastft; /* last \f added */
int nextft; /* next \f to be added */
int pclass; /* class of previous character */
int nclass; /* class of next character */
int class[LAST][LAST] ={ /* guesswork, tuned to times roman postscript */
/*OT OL IL DG LP RP SL PL IF IJ VB */
/*OT*/ { 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 0 }, /* OTHER */
/*OL*/ { 1, 0, 1, 1, 1, 1, 1, 2, 2, 2, 0 }, /* OLET */
/*IL*/ { 1, 1, 0, 1, 1, 1, 1, 3, 2, 1, 0 }, /* ILET */
/*DG*/ { 1, 1, 1, 0, 1, 1, 1, 2, 2, 2, 0 }, /* DIG */
/*LP*/ { 1, 1, 1, 1, 1, 2, 1, 2, 3, 3, 0 }, /* LPAR */
/*RP*/ { 2, 2, 2, 1, 1, 1, 1, 2, 3, 3, 0 }, /* RPAR */
/*SL*/ { 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 0 }, /* SLASH */
/*PL*/ { 2, 2, 2, 2, 2, 2, 3, 2, 3, 2, 0 }, /* PLUS */
/*IF*/ { 3, 3, 1, 2, 2, 3, 2, 3, 0, 1, 1 }, /* ILETF */
/*IJ*/ { 1, 1, 1, 1, 1, 1, 1, 2, 2, 0, 0 }, /* ILETJ */
/*VB*/ { 4, 4, 4, 4, 4, 4, 4, 4, 5, 4, 1 }, /* VBAR */
};
extern void shim(int, int);
extern void roman(int);
extern void sadd(char *);
extern void cadd(int);
extern int trans(int, char *);
int textc(void) /* read next UTF rune from psp */
{
wchar_t r;
int w;
w = mbtowc(&r, psp, 3);
if(w == 0){
psp++;
return 0;
}
if(w < 0){
psp += 1;
return 0x80; /* Plan 9-ism */
}
psp += w;
return r;
}
void text(int t, char *p1) /* convert text string p1 of type t */
{
int c;
char *p;
tbl *tp;
yyval = salloc();
ebase[yyval] = 0;
eht[yyval] = EM(1.0, ps); /* ht in ems of orig size */
lfont[yyval] = rfont[yyval] = ROM;
lclass[yyval] = rclass[yyval] = OTHER;
if (t == QTEXT) {
for (p = p1; *p; p++) /* scan for embedded \f's */
if (*p == '\\' && *(p+1) == 'f')
break;
if (*p) /* if found \f, leave it alone and hope */
p = p1;
else {
sprintf(cs, "\\f%s%s\\fP", ftp->name, p1);
p = cs;
}
} else if (t == SPACE)
p = "\\ ";
else if (t == THIN)
p = "\\|";
else if (t == TAB)
p = "\\t";
else if ((tp = lookup(restbl, p1)) != NULL) {
p = tp->cval;
} else {
lf = rf = 0;
lastft = 0;
nclass = NONE; /* get started with no class == no pad */
csp = cs;
for (psp = p1; (c = textc()) != '\0'; ) {
nextft = ft;
pclass = nclass;
rf = trans(c, p1);
if (lf == 0) {
lf = rf; /* left stuff is first found */
lclass[yyval] = nclass;
}
if (csp-cs > CSSIZE)
ERROR "converted token %.25s... too long", p1 FATAL ;
}
sadd("\\fP");
*csp = '\0';
p = cs;
lfont[yyval] = lf;
rfont[yyval] = rf;
rclass[yyval] = nclass;
}
dprintf(".\t%dtext: S%d <- %s; b=%g,h=%g,lf=%c,rf=%c,ps=%d\n",
t, yyval, p, ebase[yyval], eht[yyval], lfont[yyval], rfont[yyval], ps);
printf(".ds %d \"%s\n", yyval, p);
}
int isalpharune(int c)
{
return ('a'<=c && c<='z') || ('A'<=c && c<='Z');
}
int isdigitrune(int c)
{
return ('0'<=c && c<='9');
}
trans(int c, char *p1)
{
int f;
if (isalpharune(c) && ft == ITAL && c != 'f' && c != 'j') { /* italic letter */
shim(pclass, nclass = ILET);
cadd(c);
return ITAL;
}
if (isalpharune(c) && ft != ITAL) { /* other letter */
shim(pclass, nclass = OLET);
cadd(c);
return ROM;
}
if (isdigitrune(c)) {
shim(pclass, nclass = DIG);
roman(c);
return ROM; /* this is the right side font of this object */
}
f = ROM;
nclass = OTHER;
switch (c) {
case ':': case ';': case '!': case '%': case '?':
shim(pclass, nclass);
roman(c);
return f;
case '(': case '[':
shim(pclass, nclass = LPAR);
roman(c);
return f;
case ')': case ']':
shim(pclass, nclass = RPAR);
roman(c);
return f;
case ',':
shim(pclass, nclass = OTHER);
roman(c);
return f;
case '.':
if (rf == ROM)
roman(c);
else
cadd(c);
return f;
case '|': /* postscript needs help with default width! */
shim(pclass, nclass = VBAR);
sadd("\\v'.17m'\\z|\\v'-.17m'\\|"); /* and height */
return f;
case '=':
shim(pclass, nclass = PLUS);
sadd("\\(eq");
return f;
case '+':
shim(pclass, nclass = PLUS);
sadd("\\(pl");
return f;
case '>':
case '<': /* >, >=, >>, <, <-, <=, << */
shim(pclass, nclass = PLUS);
if (*psp == '=') {
sadd(c == '<' ? "\\(<=" : "\\(>=");
psp++;
} else if (c == '<' && *psp == '-') { /* <- only */
sadd("\\(<-");
psp++;
} else if (*psp == c) { /* << or >> */
cadd(c);
cadd(c);
psp++;
} else {
cadd(c);
}
return f;
case '-':
shim(pclass, nclass = PLUS); /* probably too big for ->'s */
if (*psp == '>') {
sadd("\\(->");
psp++;
} else {
sadd("\\(mi");
}
return f;
case '/':
shim(pclass, nclass = SLASH);
cadd('/');
return f;
case '~':
case ' ':
sadd("\\|\\|");
return f;
case '^':
sadd("\\|");
return f;
case '\\': /* troff - pass only \(xx without comment */
shim(pclass, nclass);
cadd('\\');
cadd(c = *psp++);
if (c == '(' && *psp && *(psp+1)) {
cadd(*psp++);
cadd(*psp++);
} else
fprintf(stderr, "eqn warning: unquoted troff command \\%c, file %s:%d\n",
c, curfile->fname, curfile->lineno);
return f;
case '\'':
shim(pclass, nclass);
sadd("\\(fm");
return f;
case 'f':
if (ft == ITAL) {
shim(pclass, nclass = ILETF);
cadd('f');
f = ITAL;
} else
cadd('f');
return f;
case 'j':
if (ft == ITAL) {
shim(pclass, nclass = ILETJ);
cadd('j');
f = ITAL;
} else
cadd('j');
return f;
default:
shim(pclass, nclass);
cadd(c);
return ft==ITAL ? ITAL : ROM;
}
}
char *pad(int n) /* return the padding as a string */
{
static char buf[20];
buf[0] = 0;
if (n < 0) {
sprintf(buf, "\\h'-%du*\\w'\\^'u'", -n);
return buf;
}
for ( ; n > 1; n -= 2)
strcat(buf, "\\|");
if (n > 0)
strcat(buf, "\\^");
return buf;
}
void shim(int lc, int rc) /* add padding space suitable to left and right classes */
{
sadd(pad(class[lc][rc]));
}
void roman(int c) /* add char c in "roman" font */
{
nextft = ROM;
cadd(c);
}
void sadd(char *s) /* add string s to cs */
{
while (*s)
cadd(*s++);
}
void cadd(int c) /* add character c to end of cs */
{
char *p;
int w;
if (lastft != nextft) {
if (lastft != 0) {
*csp++ = '\\';
*csp++ = 'f';
*csp++ = 'P';
}
*csp++ = '\\';
*csp++ = 'f';
if (ftp == ftstack) { /* bottom level */
if (ftp->ft == ITAL) /* usual case */
*csp++ = nextft;
else /* gfont set, use it */
for (p = ftp->name; *csp = *p++; )
csp++;
} else { /* inside some kind of font ... */
for (p = ftp->name; *csp = *p++; )
csp++;
}
lastft = nextft;
}
w = wctomb(csp, c);
if(w > 0) /* ignore bad characters */
csp += w;
}